There are multiple companies offering insurance on crypto.
Bitcoin is valued in USD/other national currencies.
Most altcoins are valued in and traded in Bitcoin.
Most people giving talks and seminars on crypto aren’t paid, but some are paid in crypto.
There are many companies who accept cryptocurrencies. For example, Living Room of Satoshi, which has already surpassed over $1m per week in bills paid in crypto in just one country.
It seems you have a lot of questions that you could very easily use google to answer. The fact that you don’t is an indication of your entitlement. You feel entitled to other people giving you the answers.